A blood pressure measuring method and system. The blood pressure measuring method includes: obtaining at least one video that captures a first body area and a second body area of a testee, where each video from the at least one video includes a plurality of frames extracting, from the frames of the at least one video, a plurality of gray scale values for corresponding images that capture the first body area and a plurality of gray scale values for corresponding images that capture the second body area drawing a pulse-wave waveform of the first body area based on the plurality of gray scale values for the corresponding images of the first body area, and drawing a pulse-wave waveform of the second body area based on the plurality of gray scale values for the corresponding images of the second body area determining a pulse-wave propagation time based on the pulse-wave waveform of the first body area and the pulse-wave waveform of the second body area and obtaining a blood pressure value of the testee based on a corresponding relation between the pulse-wave propagation time and blood pressure. The blood pressure measuring method and system can be used in a non-contact blood pressure measurement and can improve accuracy of the blood pressure measurement.
